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<title>POSIX Symbolic Names</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_regex.syntax.collating_names.posix_symbolic_names"></a><a class="link" href="posix_symbolic_names.html" title="POSIX Symbolic Names">POSIX
        Symbolic Names</a>
</h4></div></div></div>
<p>
          The following symbolic names are recognised as valid collating element
          names, in addition to any single character, this allows you to write for
          example:
        </p>
<pre class="programlisting">[[.left-square-bracket.][.right-square-bracket.]]</pre>
<p>
          if you wanted to match either "[" or "]".
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
                  </p>
                </th>
<th>
                  <p>
                    Character
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    NUL
                  </p>
                </td>
<td>
                  <p>
                    \x00
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    SOH
                  </p>
                </td>
<td>
                  <p>
                    \x01
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    STX
                  </p>
                </td>
<td>
                  <p>
                    \x02
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    ETX
                  </p>
                </td>
<td>
                  <p>
                    \x03
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    EOT
                  </p>
                </td>
<td>
                  <p>
                    \x04
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    ENQ
                  </p>
                </td>
<td>
                  <p>
                    \x05
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    ACK
                  </p>
                </td>
<td>
                  <p>
                    \x06
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    alert
                  </p>
                </td>
<td>
                  <p>
                    \x07
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    backspace
                  </p>
                </td>
<td>
                  <p>
                    \x08
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    tab
                  </p>
                </td>
<td>
                  <p>
                    \t
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    newline
                  </p>
                </td>
<td>
                  <p>
                    \n
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    vertical-tab
                  </p>
                </td>
<td>
                  <p>
                    \v
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    form-feed
                  </p>
                </td>
<td>
                  <p>
                    \f
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    carriage-return
                  </p>
                </td>
<td>
                  <p>
                    \r
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    SO
                  </p>
                </td>
<td>
                  <p>
                    \xE
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    SI
                  </p>
                </td>
<td>
                  <p>
                    \xF
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    DLE
                  </p>
                </td>
<td>
                  <p>
                    \x10
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    DC1
                  </p>
                </td>
<td>
                  <p>
                    \x11
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    DC2
                  </p>
                </td>
<td>
                  <p>
                    \x12
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    DC3
                  </p>
                </td>
<td>
                  <p>
                    \x13
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    DC4
                  </p>
                </td>
<td>
                  <p>
                    \x14
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    NAK
                  </p>
                </td>
<td>
                  <p>
                    \x15
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    SYN
                  </p>
                </td>
<td>
                  <p>
                    \x16
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    ETB
                  </p>
                </td>
<td>
                  <p>
                    \x17
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    CAN
                  </p>
                </td>
<td>
                  <p>
                    \x18
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    EM
                  </p>
                </td>
<td>
                  <p>
                    \x19
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    SUB
                  </p>
                </td>
<td>
                  <p>
                    \x1A
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    ESC
                  </p>
                </td>
<td>
                  <p>
                    \x1B
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    IS4
                  </p>
                </td>
<td>
                  <p>
                    \x1C
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    IS3
                  </p>
                </td>
<td>
                  <p>
                    \x1D
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    IS2
                  </p>
                </td>
<td>
                  <p>
                    \x1E
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    IS1
                  </p>
                </td>
<td>
                  <p>
                    \x1F
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    space
                  </p>
                </td>
<td>
                  <p>
                    \x20
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    exclamation-mark
                  </p>
                </td>
<td>
                  <p>
                    !
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    quotation-mark
                  </p>
                </td>
<td>
                  <p>
                    "
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    number-sign
                  </p>
                </td>
<td>
                  <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"></ol></div>
                </td>
</tr>
<tr>
<td>
                  <p>
                    dollar-sign
                  </p>
                </td>
<td>
                  <p>
                    $
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    percent-sign
                  </p>
                </td>
<td>
                  <p>
                    %
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    ampersand
                  </p>
                </td>
<td>
                  <p>
                    &amp;
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    apostrophe
                  </p>
                </td>
<td>
                  <p>
                    '
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    left-parenthesis
                  </p>
                </td>
<td>
                  <p>
                    (
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    right-parenthesis
                  </p>
                </td>
<td>
                  <p>
                    )
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    asterisk
                  </p>
                </td>
<td>
                  <p>
                    *
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    plus-sign
                  </p>
                </td>
<td>
                  <p>
                    +
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    comma
                  </p>
                </td>
<td>
                  <p>
                    ,
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    hyphen
                  </p>
                </td>
<td>
                  <p>
                    -
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    period
                  </p>
                </td>
<td>
                  <p>
                    .
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    slash
                  </p>
                </td>
<td>
                  <p>
                    /
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    zero
                  </p>
                </td>
<td>
                  <p>
                    0
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    one
                  </p>
                </td>
<td>
                  <p>
                    1
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    two
                  </p>
                </td>
<td>
                  <p>
                    2
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    three
                  </p>
                </td>
<td>
                  <p>
                    3
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    four
                  </p>
                </td>
<td>
                  <p>
                    4
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    five
                  </p>
                </td>
<td>
                  <p>
                    5
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    six
                  </p>
                </td>
<td>
                  <p>
                    6
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    seven
                  </p>
                </td>
<td>
                  <p>
                    7
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    eight
                  </p>
                </td>
<td>
                  <p>
                    8
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    nine
                  </p>
                </td>
<td>
                  <p>
                    9
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    colon
                  </p>
                </td>
<td>
                  <p>
                    :
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    semicolon
                  </p>
                </td>
<td>
                  <p>
                    ;
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    less-than-sign
                  </p>
                </td>
<td>
                  <p>
                    &lt;
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    equals-sign
                  </p>
                </td>
<td>
                  <p>
                    =
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    greater-than-sign
                  </p>
                </td>
<td>
                  <p>
                    &gt;
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    question-mark
                  </p>
                </td>
<td>
                  <p>
                    ?
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    commercial-at
                  </p>
                </td>
<td>
                  <p>
                    @
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    left-square-bracket
                  </p>
                </td>
<td>
                  <p>
                    [
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    backslash
                  </p>
                </td>
<td>
                  <p>
                    \
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    right-square-bracket
                  </p>
                </td>
<td>
                  <p>
                    ]
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    circumflex
                  </p>
                </td>
<td>
                  <p>
                    ~
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    underscore
                  </p>
                </td>
<td>
                  <p>
                    _
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    grave-accent
                  </p>
                </td>
<td>
                  <p>
                    `
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    left-curly-bracket
                  </p>
                </td>
<td>
                  <p>
                    {
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    vertical-line
                  </p>
                </td>
<td>
                  <p>
                    |
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    right-curly-bracket
                  </p>
                </td>
<td>
                  <p>
                    }
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    tilde
                  </p>
                </td>
<td>
                  <p>
                    ~
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    DEL
                  </p>
                </td>
<td>
                  <p>
                    \x7F
                  </p>
                </td>
</tr>
</tbody>
</table></div>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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